Mossbauer spectra and magnetic susceptibility of neptunium tetrabromide

Journal Article · Sun Feb 15 04:00:00 EST 1976 · J. Chem. Phys., v. 64, no. 4, pp. 1492-1494

OSTI ID:4024576

Stevens, J L; Jones, Jr, E R; Karraker, D G

Magnetic properties of NpBr$sub 4$ were studied from 4.2 to 20.0 degreeK with the Mossbauer resonance of the 59.54-keV $gamma$ ray in $sup 237$Np. Magnetic susceptibility was measured from 2.2 to 70.5 degreeK using a vibrating sample magnetometer at an applied field of 10 KOe. An antiferromagnetic transition was found at 12.5+-0.5 degreeK. Above the Neel temperature, NpBr$sub 4$ obeys the Curie--Weiss law, chi=C/(T+theta), with theta equal to 16.2 degreeK and an effective moment of 2.60 $mu$/subB/. The Mossbauer spectra exhibited magnetic hyperfine splitting over the temperature range 4.2 to 20 degreeK with g$sub 0$$mu$/subn/H/sub eff/=10.4 cm/sec at 4.2 degreeK. A small decline in g$sub 0$$mu$/subn/H/sub eff/ was observed for temperatures above 12 degreeK. (AIP)

• Research Organization: Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208
• NSA Number: NSA-33-025506
• OSTI ID: 4024576
• Journal Information: J. Chem. Phys., v. 64, no. 4, pp. 1492-1494, Journal Name: J. Chem. Phys., v. 64, no. 4, pp. 1492-1494; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

*NEPTUNIUM BROMIDES-- MOESSBAUER EFFECT
400702* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
HYPERFINE STRUCTURE
N40420* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE